4
3-2 Wiring Diagrams
Signal Converter Connected device
SD RD
RD SD
SG SG
＋
－
＋
＋
－
－
E
Cautions for wiring
(1)Terminal fastening torque should be
0.22 to 0.25 N
･
m
. (Use terminal driver AFP0806.)
(2) Use wire with its cross section of 0.3~1.0mm
2
(AWG#22~16) for the terminal.
(3) When using this unit as terminal station of RS485,
－
(No.5 or No.7) and E (No.8) terminal should be
shorted externally.
(4) Two
＋
terminals (No.4 and No.6) of RS485 are shorted internally.
Two
－
terminals (No.5 and No.7) of RS485 are shorted internally.
3-3 Communication
Recommended Cable
Use the transmission cables shown below for RS-485 communication system.
1) Use shielded type twist cables.
2) Use only one type of the transmission cables. Do not mix different types of the cables.
3) Use twist pair cables under a bad noise environment.
4) Be sure to connect with daisy chain the RS-485 transmission line between each unit. Connect
one end of the shielded wire to an earth ground.
5) Use 2 recommended cables with the same cross section of 0.3 to 0.34mm
2
to connect to the
RS-485 (+) and RS-485 (-) terminals.
RS-485 Wiring and setting of terminal station
1) When using shielded cable for the RS-485 transmission line, ground one end.
Use a class D dedicated earth for grounding. Do not share a ground with other earth lines. (Fig.1)
2) Be sure to connect with daisy chain the RS-485 transmission line between each unit.
Do not use a splitter. (Fig.2)
3) With a terminal station, RS-485 (E) (No.8) and RS-485 (-) (No.5 or No.7) should be shorted. (Fig.1)
RS232C
RS485
RS232C
RS485
Sheilded cable
To RS-485 device
Sheilded cable
Signal Converter or slave
General station
Class D grounding
Class D grounding
＋
Shorted
－
＋
－
E
Signal Converter or slave
Terminal station
＋
－
＋
－
E
(Fig.1)
(Fig.2)
Correct wiring
○
Incorrect wiring
×
Terminal Terminal
station
station
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